最新刊期
      卷 ， 期 1 ， 2000
      • ZHANG Xu
        Issue 1, Pages: 1-3(2000) DOI: 10.13756/j.gtxyj.2000.01.001
        摘要：The paper consists o two parts. In the first part, it describes the improvement and development of the TDM based electronic transport network, with the synchronous digital hierarchy SDH as basis, together with WDM and EDFA along the optical fiber transmission lines. In the second part of the paper, it briefly explains the general architecture of WDM based optical transport networking technology, with all the network elements being optical.  
        关键词：transport network;\ TDM（time division multiplexing）;\ WDM（wavelength division multiplexing）;\ optical fiber transmission line;\ SDH（synchronous digital hierarchy）   
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      • JIANG Li san
        Issue 1, Pages: 4-9(2000) DOI: 10.13756/j.gtxyj.2000.01.002
        摘要：This article outlines the new trends in the telecommunication network development. It also comprehensively describes the present situation of telecommunication & information network in Anhui, the various modes of IP transport, the consideration for the development of telecommunication & information network in Anhui, and the current construction of the wideband network in this province.  
          
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      • HAO Li ren,\ ZHANG Guo shan,\ SUN De xin
        Issue 1, Pages: 10-15(2000) DOI: 10.13756/j.gtxyj.2000.01.003
        摘要：This paper describes the features and key techniques of wavelength division multiplexing （WDM） system, and the development of dense wavelength division multiplexing （DWDM） system, it also discusses several issues about the application of WDM system in capacity extension for exsisting communication networks of zhengzhou electric power bureau.  
        关键词：WDM;\ ATM;\ insertion loss   
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      • LIU Xue yuan,\ ZHANG Jie,\ GU Wan yi,\ LI Guo rui
        Issue 1, Pages: 16-21(2000) DOI: 10.13756/j.gtxyj.2000.01.004
        摘要：Wavelength conversion is a key technology of all optical network. Here we discuss the impact of wavelength conversion on design of logical topology, performance and management & control of all optical network.  
        关键词：all optical network;\ wavelength conversion;\ logical topology;\ network management   
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      • LI Jin,\ YANG Jian yi,\ ZHOU Qiang,\ WANG Ming hua
        Issue 1, Pages: 22-27(2000) DOI: 10.13756/j.gtxyj.2000.01.005
        摘要：Passive optical network based on ATM（ATM-PON） is a very important technology to realize the broadband and integrated service access in the future. In this paper, we analyze the basic structure, service, key technology of the ATM PON. At the same time, some problems which should be thought about in the system design are discussed.  
        关键词：optical access network;\ ATM;\ PON   
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      • XIA Jun 1,\ \ WU Zhi Jian 2
        Issue 1, Pages: 28-31(2000) DOI: 10.13756/j.gtxyj.2000.01.006
        摘要：This paper improves on WP optimization scheme proposed by Naohide Nagatsu, by introducing longest path first wavelength assignment policy in wavelength optimization and design in all-optical networks. The improved scheme is more compact than the original WP optimization scheme and still reachs the optimization effect of the original scheme.  
        关键词：all optical networks;\ VWP;\ WP   
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      • KANG Ru ying,\ KE Xia,\ SUN Xiao han,\ ZHANG Ming de,\ DING Dong
        Issue 1, Pages: 32-36(2000) DOI: 10.13756/j.gtxyj.2000.01.007
        摘要：This article brings forward the scheme of performing the logical link control in FIN basing on IEEE802.2 protocol and according to the practical requirements of FIN,introduces the structure of LLC layer and makeup of LLC layer’s frame,and then supplies the data transfer flow between MAC layer ,LLC layer and IP layer. It provides a predigested implement of the interface in network.  
        关键词：FIN;\ LLC;\ MAC;\ IP   
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      • WU Xiang,\ WANG Yi chao,\ FENG Chong xi,\ ZHOU Lian hong
        Issue 1, Pages: 37-41(2000) DOI: 10.13756/j.gtxyj.2000.01.008
        摘要：The importance of the optical output power control in the optical communication is discussed in this paper, and a kind of power control circuit is proposed. The experimental results show that this circuit is effective in optical output power adjustment and stabilization.  
        关键词：optical output power control;\ LD;\ threshold current;\ forward current;\ monitor current   
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      • ZHENG Hong jun 1,\ LI Xin 1,\ QI Qi nian 2
        Issue 1, Pages: 42-45(2000) DOI: 10.13756/j.gtxyj.2000.01.009
        摘要：The stabling center frequency technology for transmitter in wavelength devision multiplexing system is very important. The stabling center frequency technology by temperature feedback method in high speed wavelength devision multiplexing system （2.5 Gbit/s） is studied. According to the technology principle, the high precision automatic temperature controlling module for 2.5 Gbit/s transmitter has designed and experimentalized. The module has stabled the center frequency of laser diode（LD） by controlling it’s temperature. It has supplied the light source with the characteristic of stabling center frequency for wavelength devision multiplexing system application.  
        关键词：transmitter;\ laser diode （LD）;\ wavelength devision multiplexing（WDM）;\ stabling center frequency technology by temperature feedback method;\ automatic temperature controlling module（ATCM）   
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      • Issue 1, Pages: 45(2000) DOI: 10.13756/j.gtxyj.2000.01.010
          
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      • XU Dong ming,\ NIE Min,\ JIANG Lin
        Issue 1, Pages: 46-47(2000) DOI: 10.13756/j.gtxyj.2000.01.011
        摘要：Accorrding to the recommendation of ITU about SDH an easy realization project of STM 1 and STM 4 overhead processing, Multiplexing and Demultiplexing of STM 4 is discussed in this paper. Using circuit CAD software and hardware test results the project in this paper is testified.  
        关键词：SDH;\ Overhead Processing;\ Multiplexing;\ Demultiplexing   
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      • LUO Jie 1,\ YE Pei da 1,\ QI Qi nian 2
        Issue 1, Pages: 48-52(2000) DOI: 10.13756/j.gtxyj.2000.01.012
        摘要：The relation between optical fiber structural parameters and transmission properties is simulated with finite element method. Highly nonlinear dispersion shifted fiber, broadband dispersion compensation fiber and dispersion flattened large effective area fiber are designed in this paper.  
        关键词：optical fiber design;\ optical fiber nonlinearity;\ dispersion slope   
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      • ZOU Lin sen
        Issue 1, Pages: 53-54(2000) DOI: 10.13756/j.gtxyj.2000.01.013
        摘要：In the paper, a simple formula, which is relationship between differential mode delay and refractive index profile in multi mode fibers, is given. While physical explanation is also given for differential mode（group） excitation in multi mode fibers.  
        关键词：multi mode fiber;\ differential mode delay;\ refractive index profile;\ index profile α   
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      • CHENG Shu ling,\ YIN Hong bing
        Issue 1, Pages: 55-59(2000) DOI: 10.13756/j.gtxyj.2000.01.014
        摘要：The effective area is an important parameter of single mode fiber. Up to now, its measurement has not been studied and set up in China. In this paper, it is reported that we have first time measured the FFP、NFP and the Effective Area of single mode fibers with difference Refractive Index Profiles by the Variable Aperture Technique. Based on the results, we have proved the relationship between fibers’ effective area and mode field diameter, that is supplied by the ITU T Recommendation. Meanwhile, the Effective Areas have been measured in details for fiber companies’ G.655 fiber products.  
        关键词：effective area;\ variable aperture technique;\ far field pattern;\ near field pattern   
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      • LIU Guo si 1,\ ZHOU Hao qiang 1,\ CAI Mao guo 1,\ CUI Zhe shun 2
        Issue 1, Pages: 60-62(2000) DOI: 10.13756/j.gtxyj.2000.01.015
        摘要：This paper reports our research on optical fiber delay line encoder and decoder for all optical encoding and decoding in optical code division multiplexing （OCDM）. We find that the system’s wastage rises with the rise of code weight and user number. When design system, you must consider the infection of the temperature and wastage.  
        关键词：OCDMA;\ fiber tapped delay line encoder/decoder （FTDLE/FTDLD）;\ power separate;\ delay wastage;\ temperature tremble   
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